| abstract |
(57) Abstract: A novel polyester polymer having heat resistance, low optical anisotropy and low water absorption, excellent moldability, and high surface hardness, and an optical material comprising the same. To do. A polyester containing 70% or more of repeating units represented by the following formula (1) based on all repeating units, wherein a mixed solvent (weight ratio phenol / 1, 1, 1, A polyester polymer having a reduced viscosity ηsp / C of 0.3 or more and 2.0 or less measured by melting 120 mg of the polyester in 10 ml of 2,2-tetrachloroethane = 4/6) and measuring at a constant temperature of 35 ° C. |